Search

JP-7856021-B2 - Power converter

JP7856021B2JP 7856021 B2JP7856021 B2JP 7856021B2JP-7856021-B2

Inventors

  • 木暮 晋太郎
  • 北守 隆旺

Assignees

  • 株式会社デンソー

Dates

Publication Date
20260511
Application Date
20230208

Claims (10)

  1. An inverter (11) that converts the power supplied from the battery (2), A smoothing capacitor (20) that smooths the current supplied from the battery, A Y capacitor (30) having Y capacitor elements (31, 32) for reducing noise, The inverter, the smoothing capacitor, and the case (130) housing the Y capacitor are included. The case comprises a frame (131) that opens in one direction (TD) and forms a ring, and a partition wall (136) that divides the storage space (132) surrounded by the frame into two in the same direction. An electrical component (11, 20) having the inverter and the smoothing capacitor is provided in a first storage space (141) surrounded by a part of the frame and the partition wall. The Y capacitor is provided in the second storage space (142) surrounded by the remainder of the frame and the partition wall. A power conversion device in which the electrical component and the Y capacitor are offset in a planar direction perpendicular to the aforementioned direction, such that the electrical component and the Y capacitor do not overlap in the aforementioned one direction.
  2. The inverter, the smoothing capacitor, and the battery are further comprising first wiring (10A, 10B) electrically connected to the battery. The Y capacitor further comprises second wirings (41, 42) connected to the first wiring, A hole (138) penetrating in one direction is formed in the partition wall. The second wiring is passed through the hole. The power conversion device according to claim 1, wherein the connection point between the first wiring and the second wiring is provided at a position that overlaps with the hole in the first storage space.
  3. The first wiring, the second wiring, and a connector (81) for electrically connecting the battery are further provided. The connector comprises a power supply unit (82) to which power is supplied from the battery, and a power distribution unit (83) that is connected to the first wiring and the second wiring on the first storage space side. The supply unit is provided in the frame. The hole is formed in the partition wall adjacent to the portion of the frame where the supply unit is provided. The power conversion device according to claim 2, wherein the Y capacitor is provided in the second storage space so as to cover the hole.
  4. The aforementioned Y capacitor is A GND busbar (50) connects the Y capacitor element to ground via the case, A Y capacitor case (33) having storage sections (34A, 34B) for housing the Y capacitor element and a portion of the second wiring, The storage section further comprises a covering resin (36) that covers the Y capacitor element and a portion of the second wiring, The Y capacitor is provided in the second storage space such that the exposed surface (36A) of the coating resin faces the first storage space. The power conversion device according to claim 3, wherein the connection terminals (51, 52) connected to the Y capacitor element in the GND busbar are provided on the first storage space side with respect to the Y capacitor element in one direction.
  5. The system comprises two of the aforementioned Y capacitor elements, two of the second wiring, and two of the aforementioned storage compartments. Each of the aforementioned storage compartments is provided with one Y capacitor element and one second wiring, The Y capacitor case further includes a connecting portion (35) that connects the two storage portions, A portion of the extension (53) of the GND busbar that extends from the connection terminal extends along the connecting portion, The power conversion device according to claim 4, wherein the extension portion is provided with a case connection portion (54) connected to the case.
  6. Each of the two Y-capacitor elements comprises a first element terminal (31A, 32A) connected to the second wiring and a second element terminal (31B, 32B) connected to the GND busbar. The power conversion device according to claim 5, wherein the second element terminal is provided closer to the case connection portion than the first element terminal.
  7. The power conversion device according to claim 6, wherein the cross-sectional area of the extension perpendicular to its own longitudinal direction is greater than the cross-sectional area of the connection terminal perpendicular to its own longitudinal direction.
  8. The second wiring is soldered to the first element terminal on the outside of the covering resin. The GND busbar is soldered to the second element terminal outside the covering resin. The second wiring is routed inside the covering resin while extending from the connection point with the first element terminal toward the connection point with the first wiring. The power conversion device according to claim 7, wherein the GND busbar is routed inside the covering resin while extending from the connection portion with the second element terminal toward the case connection portion.
  9. The power conversion device according to claim 8, wherein the portion of the GND busbar covered with the coating resin faces the Y capacitor element.
  10. The power conversion device according to claim 9, wherein the housing section has an intervening wall (37) between the Y capacitor element and the portion of the second wiring covered by the covering resin, which suppresses heat transfer between the Y capacitor element and the second wiring.

Description

The disclosures described herein relate to power conversion devices. The power conversion device described in Patent Document 1 comprises a switching element, a smoothing capacitor, a Y-capacitor for reducing noise generated by the switching element, and a housing for housing these components. Japanese Patent Publication No. 2021-118665 This is an electrical circuit diagram of a power conversion device.This is a plan view of the power converter as seen from the first storage space.This is a plan view of the power converter as seen from the second storage space.This is a cross-sectional view along the line IV-IV shown in Figure 3.This is an exploded perspective view illustrating the placement of the Y capacitor in the second storage space.This is a perspective view illustrating the placement of the Y capacitor in the second storage space.This is a perspective view of a Y-capacitor.Figure 7 shows a cross-sectional view of the Y capacitor along the line VIII-VIII.Figure 7 shows a cross-sectional view of a Y capacitor along the IX-IX line.This is a cross-sectional view illustrating a modified example of a Y capacitor. The following describes several embodiments for implementing this disclosure, with reference to the drawings. In each embodiment, parts corresponding to those described in a previous embodiment may be denoted by the same reference numerals, and redundant explanations may be omitted. If only a part of the configuration is described in each embodiment, other embodiments described previously may be applied to the remaining parts of the configuration. Furthermore, not only are combinations of parts explicitly shown as possible in each embodiment possible, but it is also possible to partially combine embodiments with each other, embodiments with modified versions, and modified versions with each other, even if not explicitly shown, as long as there are no particular problems with the combination. (First Embodiment) <In-vehicle systems> Figure 1 is an electrical circuit diagram of the power converter 10 mounted on the in-vehicle system 1. The in-vehicle system 1 is equipped with a high-voltage battery 2, a low-voltage battery 3, a motor generator 4, a control device 5, and the power converter 10. The vehicle on which the in-vehicle system 1 is installed is a hybrid vehicle capable of driving by switching between and/or combining the driving force of the engine and the driving force of the motor generator 4. The power converter 10 includes high-voltage wiring 10A, 10B, an inverter 11, a control circuit board 15, a smoothing capacitor 20, a Y-capacitor 30, a high-voltage connector 81, and a low-voltage connector 91. High-voltage wiring 10A is connected to the positive terminal of the high-voltage battery 2. High-voltage wiring 10A may be referred to as P-side high-voltage wiring 10A. High-voltage wiring 10B is connected to the negative terminal of the high-voltage battery 2. High-voltage wiring 10B may be referred to as N-side high-voltage wiring 10B. The inverter 11 and smoothing capacitor 20 may be referred to as electrical components. The electrical components consist of the inverter 11 and the smoothing capacitor 20. The inverter 11 is connected to the P-side high-voltage wiring 10A and the N-side high-voltage wiring 10B. The inverter 11 has multiple semiconductor modules 12. Each semiconductor module 12 has two switching elements 13 and two diodes 13A. Two switching elements 13 are connected in series between the P-side high-voltage wiring 10A and the N-side high-voltage wiring 10B. The P-side input terminal 11A, connected to the high-voltage battery 2, is connected to the collector electrode of one of the two switching elements 13, which is located on the P-side. The N-side input terminal 11B, also connected to the high-voltage battery 2, is connected to the emitter of one of the two switching elements 13, which is located on the N-side. The anode of diode 13A is connected to the emitter of the corresponding switching element 13. The cathode of diode 13A is connected to the collector of the corresponding switching element 13. The emitter of the P-side switching element 13 and the collector of the N-side switching element 13 are connected to the motor terminal 11C, which is connected to the motor generator 4. Multiple switching elements 13 convert the DC power supplied from the high-voltage battery 2 into AC power that can drive the motor generator 4. The converted power is supplied to the motor generator 4 via the connecting busbar 14. The control circuit board 15 controls the on/off state of multiple switching elements 13 using operating power supplied from the low-voltage battery 3. The control circuit board 15 has a control circuit mounted on it that controls the on/off state of the multiple switching elements 13. The connection terminals 11D of the multiple switching elements 13 are soldered to the control circuit board 15. The connection terminals 11D of the multiple switching elements 13 are e